Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 5 18.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 05/18/2021   10:29:21   (  -0.01,-137.20) (  -0.82,-133.56)  414.89                80
 05/19/2021   22:53:38   (   0.00,-137.20) (  -0.35,-138.77)  179.63                80
 05/20/2021   22:32:00   (   0.01,-137.19) (   0.68,-134.19)  343.14                80
 05/22/2021   10:56:07   (  -0.00,-137.20) (   0.50,-139.36)  246.82                80
 05/23/2021   10:34:30   (  -0.01,-137.19) (  -0.53,-134.77)  275.53                80
 05/24/2021   22:58:46   (   0.00,-137.17) (  -0.64,-139.98)  320.40                80
 05/25/2021   22:37:09   (   0.01,-137.16) (   0.40,-135.39)  201.40                80
 05/27/2021   11:01:16   (  -0.01,-137.15) (   0.79,-140.56)  390.17                80
 05/28/2021   10:39:39   (  -0.01,-137.13) (  -0.25,-135.98)  131.14                80
 05/29/2021   23:01:15   (   0.01,-137.10) (  -0.92,-141.19)  466.33                80
 05/30/2021   22:44:57   (   0.00,-137.08) (   0.12,-136.60)   54.81                80